Anti-loose device for a motor

ABSTRACT

An anti-loose device for a motor includes a hollow shaft and a motor set. The hollow shaft seat, being provided with a recess and the motor set has an insulation frame, a silicone sheet and a locating member disposed between the insulation frame and the recess. The locating member has an engaging part, a first end part and a second end part and the engaging part is inset the recess with the first and the second end parts resisting the shaft seat and the upper edge of silicone steel sheet respectively so as to generate a function of locating the motor set.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention is related to an anti-loose device for a motor and particularly to a device, which is formed by way of a locating member provided at the shaft seat of the motor to secure the motor so as to avoid the motor occurring a phenomenon of loosening.

2. Brief Description of the Related Art

Due to computer information industry progressing rapidly, the central processing unit (CPU) in the information product provides faster speed of operation and it results in more heat generation. In order to remove the heat effectively, heat dissipation device is one of least basic equipment in the information product. The most popular heat dissipation device is the cooling fan because of the cooling fan being used extremely conveniently and cheaper. For quality of a cooling fan, it depends on running condition of the motor and the whole system or device being in a state of normal running is completely affected by the motor performance being running steady or not. The bearing in the motor further is a key factor influencing quality and steadiness of the motor.

Conventionally, the stator is adhered to shaft seat of the fan base with coated glue but the coated glue is easy to become peeling off resulting from vibration during the motor running. Consequently, the motor moves away the original location to affect ruing performance of the motor to occur side effect such as more serious vibration, louder noise, more heat generation and power useless consumption.

Taiwanese Patent Official Gazette No. 566757 discloses secure device for the stator in a motor, which has a retaining part composed of a locating part and a holding part. The holding part is inset to a recess groove of a sleeve and the locating part presses top of a coil seat on the stator. However, the preceding sleeve and the coil seat are different in height so that the inconsistent heights have to be counted during the locating part being made and it results in difficulty in the process of fabricating the locating part and fabrication cost increase. Besides, although the specification recites the locating part extends to a lateral side toward the coil till the whole coil of the stator to avoid the coil and the rotor being friction each other. However, the locating part extending to cover the entire coil moves the position of friction to the locating part as long as the coil and the rotor friction each other. In this way, noise is created and it is obvious the prior art is contradicted. Not only the retaining part has to be increased material thereof but also heat generating from motor running must be not easy to dissipate because of locating part extending to cover the whole coil.

SUMMARY OF THE INVENTION

A primary object of the present invention is to provide an anti-loose device for a motor, which has at least a locating member at the shaft seat of the motor to intensify support for the stator and prevent the motor from loosening.

Another object of the present invention is to provide a an anti-loose device for a motor, which can exert a pre-pressure to a bearing received in the shaft seat by way of the locating member extending to inside the shaft seat so as to keep the bearing in a state of steady running.

BRIEF DESCRIPTION OF THE RAWINGS

The detail structure, the applied principle, the function and the effectiveness of the present invention can be more fully understood with reference to the following description and accompanying drawings, in which:

FIG. 1 is a sectional view of the first embodiment of an anti-loose device for a motor according to the present invention;

FIG. 2 is an enlarged diagram of the dashed circle shown in FIG. 1;

FIG. 3 is a semi-sectional perspective view of the locating member shown in FIG. 2;

FIG. 4 is a sectional view of the second embodiment of an anti-loose device for a motor according to the present invention;

FIG. 5 is an enlarged diagram of the dashed circle shown in FIG. 4;

FIG. 6 is a semi-sectional perspective view of the locating member shown in FIG. 5;

FIG. 7 is another semi-sectional perspective view of the locating member shown in FIG. 3;

FIG. 8 is another semi-sectional perspective view of the locating member shown in FIG. 6;

FIG. 9 is a further semi-sectional perspective view of the locating member shown in FIG. 6;

FIG. 10 is a further semi-sectional perspective view of the locating member shown in FIG. 6;

FIG. 11 is a further semi-sectional perspective view of the locating member shown in FIG. 3;

FIG. 12 is a further semi-sectional perspective view of the locating member shown in FIG. 3; and

FIG. 13 is a top view illustrating how the locating members shown in FIGS. 9, 10, 11 and 12 being used.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIG. 1, the first embodiment of an anti-loose device for a motor according to the present invention includes a fan blade set 10, a motor set 20 and a fan base 30. The fan blade set 10 is composed of a fan blade hub 11, a spindle 12, a motor case 13 and a magnetic strip. The spindle 12 is joined to a spindle seat 111 formed at the center of the inner bottom of hub 11. The motor case 13 is disposed at the inner lateral side of the hub 11 and the magnetic strip 14 is disposed at the inner lateral side of the motor case 14.

The motor set 20 is attached to the fan base 30 and composed of an insulation frame 21, a silicone steel sheet 22, a circuit board 23 and a coil 24. The silicone steel sheets are disposed surrounding the insulation frame 21. The fan base 30 has a shaft hollow seat 31 at the center thereof and the circuit board 23 is disposed between the bottom of the insulation frame 21 and the shaft hollow seat 31. The spindle 12 is received in the shaft hollow seat 31 and at least a bearing 32 is attached between the spindle 12 and the shaft hollow seat 31. The bearing 32 can be a ball bearing and the spindle 12 rotates under support of the bearing 32. A spring R is disposed between the bearing 32 and the hub 11.

The shaft hollow seat 31 has a projection 311 at the inner rim thereof and the spindle 12 engages with a retaining ring 15 at the end away from the hub 11 such that the bearing 32 is located in place by way of the projection 311 resisting against the bearing 32 and the bearing 32 interferes the retaining ring 15 to prevent the spindle 12 from loosening during rotating.

Besides, Referring to FIG. 2, the shaft hollow seat 31 has a recess 312 and a locating member 40 is arranged between the recess 312 and the insulating frame 21. The locating member 40 basically is provided with a shape of ring as shown in FIGS. 3, 6, 7 and 8 or a shape of non-ring as shown in FIGS. 9, 10, 11 and 12 and has an engaging part 41, a first end part 42 and a second end part 42′. The first and second end part 42, 42′ press against the shaft hollow seat 31 and the upper edge of the silicone steel sheet 22 while the engaging part 41 inset the recess 312 such that the motor set 20 is capable of being located properly.

Referring to FIGS. 4 and 5, the second embodiment of anti-loose device for a motor according to the present invention is different from the preceding first embodiment in that the first end part 42 extends downward toward the inner side of the shaft hollow seat 31 to press against the bearing 32 so as to constitute a pre-pressure for the bearing 32 lessening vibration itself and running steadily. If the ball bearing is utilized, the bearing outer ring and the inner steel balls creating internal clearances can be avoided such that friction, noise, heat generation and power useless consumption can be decreased so as to enhance performance of the motor while running, avoiding motor loosening and extending life span of the motor.

Referring to FIGS. 7 and 8, further typical examples of the locating member 40 are illustrated and the locating members are different from the preceding first and second embodiments in that a plurality of the engaging part 41 of the locating member 40 and the second end part 42′ are provided at the locating member 40 in short sections so that the first and second end parts 42, 42′ press against the shaft hollow seat 31 and the upper edge of the silicone steel sheet set 22 while the engaging part 41 inset the recess 312 such that the motor set 20 is capable of being located properly.

Referring to FIGS. 9, 10, 11 and 12, further typical examples of the locating member 40 are illustrated and the locating members are different from the preceding first and second embodiments in that a plurality of non-circular locating members 40 are distributed at the motor set 20 as shown in FIG. 13. That is, the engaging part 41 is inset the recess 312 and the second end part 42′ are provided at the locating member 40 in short sections so that the first and second end parts 42, 42′ press against the shaft hollow seat 31 and the upper edge of the silicone steel sheet set 22 as shown in FIGS. 11 and 12 or the first end part 42 extends downward toward the inner side of the shaft hollow seat 31 to press against the bearing 32 as shown in FIGS. 9 and 10. It is noted that the rest parts, which are identical with the First and the second embodiments, are not described the details thereof further.

While the invention has been described with referencing to preferred embodiments thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention, which is defined by the appended claims. 

1. An anti-loose device for a motor, comprising: a hollow shaft seat, being provided with a recess; and a motor set, having an insulation frame, a silicone sheet and a locating member disposed between the insulation frame and the recess; characterized in that the locating member has an engaging part, a first end part and a second end part and the engaging part is inset the recess with the first and the second end parts resisting the shaft seat and the upper edge of silicone steel sheet respectively so as to generate a function of locating the motor set.
 2. The anti-loose device for a motor as defined in claim 1, wherein the first end part extends downward toward the inner side of the hollow shaft to press against the bearing.
 3. The anti-loose device for a motor as defined in claim 1, wherein engaging part and the second end part are provided as a plurality of separate sections on the locating member.
 4. The ant-loose device for a motor as defined in claim 1, wherein a plurality of locating members are distributed on the motor set.
 5. The anti-loose device for a motor as defined in claim 2, wherein engaging part and the second end part is provided as a plurality of separate sections on the locating member.
 6. The ant-loose device for a motor as defined in claim 2, wherein a plurality of locating members are distributed on the motor set. 